Internal combustion engine



FIG. 1 is a front view showing an internal combustion engine according to the present invention;

FIG. 2 is a rear view showing the internal combustion engine of FIG. 1;

FIG. 3 is a top plan view showing the internal combustion engine of FIG. 1;

FIG. 4 is a bottom plan view showing the internal combustion engine of FIG. 1;

FIG. 5 is a right side view showing the internal combustion engine of FIG. 1;

FIG. 6 is a left side view showing the internal combustion engine of FIG. 1;

FIG. 7 is a front perspective view showing the internal combustion engine of FIG. 1; and,

FIG. 8 is a rear perspective view showing the internal combustion engine of FIG. 1. 

The ornamental design for an internal combustion engine, as shown and described. 